Process for treating and purifying gases containing hydrogen sulphide



Patented Jan. 8, 1924.

UNITED STATES 1,419,852 PATENT OFFICE.

ALFRED ENG-ELHABDT, OF WIESDOBF, PBUSSIA, GERMANY, ASSIGNOR '10 FABBEII- FABRIKEN YORK. FBIEDR. BAYER ADI D 00., OF LEVERKUSEN, HEAR COLOGNE-- ONJI'HEQBHIHE, GER-HART.

PEOCBS FOR TREATING AND PUBIFYING GASE CONTAINING KYDBDGEN SULPEIDE.

Io Drawing.

To all whom'z't may concern:

Be it known that I, ALFRED Examiner, doctor of philosophy, a citizen of Germany, residing at Wiesdorf Germany, have invented new and useful Improvements in Processes for Heating and Purifying Gases Containing Hydrogen Suphide (for which ipplications have been ed in Germany, ay 24, 1917, Patent No. 303,862; Germany, July 3, 1918, Patent No. 338,829; Germany,

October 2, 1918, Patent No. 371,400; Germany, Oct. 3, 1918, Patent No. 337,059;

Germany, Oct. 30, 1919, Patent No. 340,036; France, June 19, 1920, Patent No. 517,483; England, Oct. 15, 1920, Patent No, 153,297; Austria, Apr. 2,1918, Patent No.87,471; Austria June 18, 1920 Patent No. 89,931; Italy, June 21, 1920, Patent, No. 532,125; Belgium, June 17, 1920, Patent No. 287 ,648; Switzerland, June 28, 1920, Patent No.

89,553), of which the following is a specification.

As is known sulfur can be obtained on a large scale by leading h drogen sul' hide 26 or gases containin it whi e mixed wit air over ferric oxid or auxite at a dull red heat to effect the reaction:

This method however is not economical and the reaction isincomplete as part of the H,S remains in thegasfand part of it is oxidized to sulfur dloxid, moreover mixtures containing combustible u are obtained by the dry dist ation of coal -cannot be employed in this process.

According to this invention hydrogen sulphide gas mixed with the quantity of air or oxygen necmary to efi'ect the formation to of sulfur is brought into contact with a specially porous active carbon such as described in the German cification 290656 of April th, 1914, whic has been treated with deliydratin agents. According to German atent 0. 290,656 a highly active charcoal is obtained by heating a carboncontaining substance, such as wood, cellulose, starch, coal, .ofi'al, etc, with zinc chloride. the reaction.

External heat is w: y for The sulfur separates out in the carbon in a very finely divided state." It is then isolated and purified by sublima-' tion or by extraction with a solvent, such as carbon bisulfid, monoor dlchlo'rbenzene.

see, such as 7 Application mediums, m1. sum No. 400,712.

If gases having a "high content of H 8 are employed a considerable evolution of heat takes-place and the sulfur precipitates upon the carbon either in a fused state or as flowers of sulfur. All kinds of gases containin h drogen sulphide may be employe an the process may alsobe used for completely desulfurizing llluminating as.

The action of the orous active car on in question is extraordlnarily intense and it has been found to absorb more than its own wei ht of sulfur. These carbons are thus muc superior to ordinary vegetable or animal charcoal.

In order to illustrate the process more fully the following example 1s given :-A mixture of 2 volumes of hydrogen sulphide and 5 volumes of air is led through a cylindrical tube filled with 1000 volumes of charcoal as described in the German specification 290656 of April 25th, 1914. A

fused sulfur runs out of the a paratus. Instead of oxygen sulfur dioxi can be used.

f a gas is used having a small content of hydrogen sulphide the oxidation of hy drogen sul hide into sulfur is accelerated by the ad ition of small uan'tities of ammonia or amins. Even a arge quantity of gas containing these additions requires a. smaller carbon filter than a gas not containing these additions. On using S0, of

course amins cannot be used.

I claim 1. Process of oxidizing hydrogen sulphide A which comprises contacting gas containing hyldrogen sulphide and oxygen with porous active carbon such as may be obtained by heating carbonaceous organic materials with dehydrating agents.

2. Process 0 oxidizing hydrogen sulphide which comprises contacting gas containing hydrogen sulphide and oxygen with orous hydrogen sulphide and an oxidizing I 75 strongevolution of heat takes place. The

de ydrating a cut.

5. Process 0 oxidizing hydrogen sulphide which comprises contacting gas containing hydrogen sulphide,'01iygen and an amine with porous active carbon capable of'causing the hydrogen sulphide oxygen to react in the absence of externally ap lied heat.

'6. Process of oxidizing 'hy rogen sulphide which comprises contacting a gas containing hydrogen sulphide mixed wlth air and a Egsic nitrogen compound wit'll'ipomllsaififlil-fi Process asrdefined iriiflhiifi fihich ammonia is the basic nllirogen compound employed.

In testimony whereof IQlIaYQgh eI' QQ!/%fit my hand in the'presenceof mg witnesses. V

ALFRED ENGELHARDT. [1 s.]

Witnesses:

J OHANNA NORRENBERG. JoHANNEsOfrEIUs. 

